First data point via the Pentametric tracking software.
2:00 PM - 94% SOC
I got side tracked and finally came back when it was at 94% SOC...
Data Point 94% SOC @ 2:00 PM = -4.15 Ah's
Here is where the data begins to get interesting. It took just -4.15 Ah's to go from 0% - 94% SOC with the 12V adapter. This is looking very good at this point....
2:41 PM - 100% SOC
Sadly I missed the data print screen for 99% SOC, which occurred at 2:30 PM. It finally ticked over to 100% sometime between 2:40 & 2:41 PM as I was doing a quick screen check every minute after 99%..
Data Point 100% SOC @ 2:41 PM = -4.36 Ah's
As in many other observations one can easily see how much more efficient it is to remain DC throughout the entire charging process.
To go from 0% SOC to 100% SOC using straight DC>DC, as opposed to DC>AC>DC we saved 1.28 Ah's of energy (5.64 Ah - 4.36Ah = 1.28)!!!
Put another way when using the 400W inverter and Apple 120V adapter to charge this iPad it uses 29% more energy to for a complete charge cycle.
Total Charge Duration = 4:41
Total Energy Consumed = -4.36 Ah
Average Current = 0.8A -1.1A
So what's the bottom line?
If you want to charge as efficiently as possible, stay with DC!
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